Plainsong, also known as plainchant, and more specifically Gregorian, Ambrosian, and Gallican chant, refer generally to a style of monophonic, unaccompanied, early Christian singing performed by monks and developed in the Roman Catholic Church mainly during the period 800-1000 . The differences may be marginal—or even great, in some cases. These differences reflect the great ethnic, cultural and linguistic diversity that existed after the fall of the Roman Empire on the Italian peninsula. Different monastic traditions arose within the Roman Catholic Church throughout Italy, but at different places and at different times. Even a musical non-specialist can hear the difference, for example, between the straightforward tone production in the Ambosian chants from Milan and the chants from Benev